We probably shouldn’t have anticipated that Donald Rumsfeld would open up to documentarian Errol Morris in the same way that former defense secretary Robert McNamara did for the film The Fog of War. But that doesn’t make the Morris conversations with Rumsfeld — presented in the new film The Unknown Known — any less fascinating. While reviews out of festivals talked about how little Rumsfeld deviates from prior statements about intelligence and the latter Bush administration, significant aspects of his personality and mindset are still revealed in the interviews.